William mitchell



(No Model.)

W. MITCHELL.

DIE FOR UPSETTING THE HEADS 0F EYE BARS.

No. 438,112. Patented Oct. 7,1890.

UNITE STATES ATENT FFICE.

I/VILLIAM MITCHELL, OF CLEVELAND, OHIO, ASSIGNOR TO THE KING IRON BRIDGE AND MANUFACTURING COMPANY, OF SAME PLACE.

DIE FOR UPSETTING THE HEADS OF EYE-BARS.

SPECIFICATION forming part of Letters Patent No. 438,112, dated October 7, 1890.

I Application filed July 23, 1890. Serial No. 359,584:- (No model.)

.To all whom it may concern.-

Be it known that 1, WILLIAM MITCHELL, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Dies for Upsetting Metal Bars; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in dies for upsetting metal bars designed more especially for manufacturing eye-bars; and it consists in certain features of construction and in combination of parts hereinafter described, and pointed out in the claims.

In manufacturing eye-bars the difficulty has been to hold the bar from kinking or bending laterally while it is being upset and thereby broadened to fill the chamber of the die. For this purpose various devices have been employed-such, for instance, as shown in United States Patent No. 380,413, granted April 3, 1888, to W. R. WVebster.

My improved mechanism for the purpose is illustrated in the accompanying drawings.

Figure 1 is a plan with the top die or cover removed. Fig. 2 is an elevation in longitudinal section through the center of the die. Fig. 3 is an end elevation in section on line 00 m, Fig. 2.

A and B represent, respectively, the lower and upper die, and C the plunger, the lower die being stationary and the upper die being adapted to be raised the necessary distance in order to take out the work.

In Fig. 1 is shown the die C drawn back after forming eye-bar G.

In dotted lines G, Fig. 1, is shown the blank before upsetting, and at G is shown the head of the eye-bar after the upsetting.

Die B has a longitudinal T-shaped recess 1), opening, as shown, at the bottom of this i die. In this recess operates slide D, the lower face of the slide being flush with the lower face of die 13. This slide above is backed by a series of rollers E for holding down the slide, but leaving the latter free to move endwise in the recess, and as in operating the dies there is a heavy upward pressure brought to bear on slide D these rollers greatly reduce the friction of the slide in moving endwise. The rollers have small trunnions e, that are journaled in lateral holes in the small side bars 6, whereby the series of rollers are kept in proper place relative to each other.

Slide D is providedwith a vertical hole, usually at the longitudinal center thereof, for receiving shank f of punch or tool F, the slide around the hole being countersunk on top, as shown, for receiving nut f, that holds the punch or tool in place. Member F may be of any desired size or form in cross-section, and this tool depends from the face of the slide any desired distance, more or less, according to the thickness of the metal bar being up set. In closing down the upper die B upon the blank the punch or tool F is forced down into the heated blank-say a quarter of an inch, half an inch, more or less, according to cir- 7e cumstances-this tool indenting and forcing its way into the blank, so as to retain a strong hold on the latter. As the metal is upset, tool F and slide D are carried along in the direction that the plunger is moving by the flow of 7 5 the metal that is being upset engaging the punch or tool, and this punch or tool holding the blank from moving laterally or kinking. The punch or too] first engages the blank at such a point that when the upsetting is completed the tool will be in a central position relative to the upset head, and when the head is subsequently drilled or punched to form the eye thereof the depression made by tool F is entirely cutaway, leaving nothing to disfigure the work. The face of the punch or tool should be something less in plan than the eye that is afterward made in the upset head.

In Fig. 1 in dotted lines is shown at I approximately the point where the tool F first a engages the blank, and at I is shown the position of the tool at the completion of the upsetting. In this class of work the upset head is usually, but not necessarily, of the same thickness as the blank and consequently the upsetting spreads the metal to form'the broad head desired, and to do this a considerable length of the blank is upset.

Suitable clamps (not shown) are of course provided for holding the blank endwise while roe being upset. The lower die A might be pro vided with a recess, the same as shown at b but inverted, for receiving the slide D, in which case tool F would project upward and engage the lower side of the blank; but the result would be the same in holding the blank from kinking or bending laterally. For heavy work it might be well to have both the top and bottom dies provided with slides D and tool F, so that the latter might respectively engage the top and bottom of the blank.

'What I claim is 1. The combination, with dies for upsetting and spreading rectangular bars, of a traveling punch or tool connected with one of the dies, such punch or toolbeing adapted to indent the blank in closing the dies and being adapted to travel in the direction that the plunger moves in upsetting the blank, whereby the engagement of the tool with the blank prevents the latter from deflecting laterally, substantially as set forth.

"2. The combinaton, with upsetting dies for forging the head of eye-bars, of a movable punch or tool connected with one of the dies, such punch or tool being adapted to indent the blank in closing the dies and being adapt ed to move lengthwise of the blank with the flow of metal in upsetting the blank, substantially as set forth.

3. In upsetting-dies for forging the heads of eye-bars, the combination, with one of the dies provided with a longitudinal recess in the face thereof, of a slide adapted to reciprocate in such recess, such slide-bearing a punch or tool adapted to engage and indent the blank in closing the dies, substantially as set forth.

In testimony whereof I sign this specification, in the presence of two witnesses, this 22d day of May, 1890.

WILLIAM MITCHELL Witnesses:

C. H. DORER, WARD HOOVER. 

